- an upward push or thrust
- Geol. an upheaval of a part of the earth's crust
An example of an upthrust is a piece of land being shifted upward after an earthquake.
tr. & intr.v.up·thrust·ed, up·thrust·ing, up·thrusts
(third-person singular simple present upthrusts, present participle upthrusting, simple past and past participle upthrusted)
- to thrust something upwards
- (intransitive) to be thrust upwards